With the 9-volt alone, his phone dropped from 77 to 76 percent during five minutes of attempted charging. But a bit later, when it was at 75 percent, I managed to charge it to 77 percent in five ...

Smaller than most of the keys in your pocket when folded away and weighing even less, the flexible Plan V opens to reveal a spot to plug in a 9-volt, as well as a microUSB port for connecting it ...

In one test a paper clip resting on a 9 volt battery heated up and, in about 10 minutes, had turned a Kleenex next to it brown. The same spark process worked when steel wool was placed next to the ...

This comes with a glaring drawback, in that you'll need to either carry a battery around or be near somewhere that sells one. Still, at least the Plan V only weighs 7 grams (0.24 oz), and is ...

But one of those things could cause a fire - a 9-volt battery. Firefighters showed why it's a danger. With fire extinguishers and a crew standing by, Chief Kevin MacCaffrie demonstrated.